Mulally, who has university degrees in engineering and management, will serve on Google's audit committee.

"I am honored to serve on the board of a global iconic company that is dedicated to enhancing our lives," Mulally said in the blog post. "I look forward to working together with the Google board and management team to continue to deliver their compelling vision."

Driverless Car Draws Near

Google in May unveiled plans to build its own self-driving car -- minus the steering wheel -- that it hoped to begin testing this year.

"They won't have a steering wheel, accelerator pedal, or brake pedal because they don't need them," Google's Chris Urmson said in a blog post at the time. "Our software and sensors do all the work."

Urmson, who directs the self-driving car project, said Google plans to build about 100 prototypes, "and later this summer, our safety drivers will start testing early versions of these vehicles that have manual controls."

He added, "If all goes well, we'd like to run a small pilot program here in California in the next couple of years."